C-12-Q046mediumsingle_mcqx+y=a+b, ax+by=a2+b2x + y = a + b,\; ax + by = a^2 + b^2x+y=a+b,ax+by=a2+b2 সমীকরণজোটের সমাধান (x,y)(x, y)(x,y) কত?a(a,b)(a, b)(a,b)b(b,a)(b, a)(b,a)c(a−b, a+b)(a - b,\; a + b)(a−b,a+b)d(0,0)(0, 0)(0,0)